fill-in

Noun

1.

fill-in - someone who takes the place of another (as when things get dangerous or difficult); "the star had a stand-in for dangerous scenes"; "we need extra employees for summer fill-ins" Synonyms: backup man, reliever, stand-in, backup, substitute, relief

alternate, backup, backup man, compeer, double, equal, fill in, locum, locum tenens, match, peer, relief, reliever, replacement, stand in, stand-in, stunt man, stunt woman, sub, substitute, surrogate